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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "core/layout/ng/ng_absolute_utils.h" | 5 #include "core/layout/ng/ng_absolute_utils.h" |
6 | 6 |
7 #include "core/layout/ng/ng_constraint_space.h" | 7 #include "core/layout/ng/ng_constraint_space.h" |
8 #include "core/layout/ng/ng_length_utils.h" | 8 #include "core/layout/ng/ng_length_utils.h" |
9 #include "core/style/ComputedStyle.h" | 9 #include "core/style/ComputedStyle.h" |
10 #include "platform/LengthFunctions.h" | 10 #include "platform/LengthFunctions.h" |
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78 // Solving the equation: | 78 // Solving the equation: |
79 // left + marginLeft + width + marginRight + right = container width | 79 // left + marginLeft + width + marginRight + right = container width |
80 if (!left && !right && !width) { | 80 if (!left && !right && !width) { |
81 // Standard: "If all three of left, width, and right are auto:" | 81 // Standard: "If all three of left, width, and right are auto:" |
82 if (!margin_left) | 82 if (!margin_left) |
83 margin_left = LayoutUnit(); | 83 margin_left = LayoutUnit(); |
84 if (!margin_right) | 84 if (!margin_right) |
85 margin_right = LayoutUnit(); | 85 margin_right = LayoutUnit(); |
86 DCHECK(child_minmax.has_value()); | 86 DCHECK(child_minmax.has_value()); |
87 width = child_minmax->ShrinkToFit(container_size.width); | 87 width = child_minmax->ShrinkToFit(container_size.width); |
88 if (space.Direction() == TextDirection::Ltr) { | 88 if (space.Direction() == TextDirection::kLtr) { |
89 left = static_position.LeftPosition(container_size.width, *width, | 89 left = static_position.LeftPosition(container_size.width, *width, |
90 *margin_left, *margin_right); | 90 *margin_left, *margin_right); |
91 } else { | 91 } else { |
92 right = static_position.RightPosition(container_size.width, *width, | 92 right = static_position.RightPosition(container_size.width, *width, |
93 *margin_left, *margin_right); | 93 *margin_left, *margin_right); |
94 } | 94 } |
95 } else if (left && right && width) { | 95 } else if (left && right && width) { |
96 // Standard: "If left, right, and width are not auto:" | 96 // Standard: "If left, right, and width are not auto:" |
97 // Compute margins. | 97 // Compute margins. |
98 LayoutUnit margin_space = container_size.width - *left - *right - *width; | 98 LayoutUnit margin_space = container_size.width - *left - *right - *width; |
99 // When both margins are auto. | 99 // When both margins are auto. |
100 if (!margin_left && !margin_right) { | 100 if (!margin_left && !margin_right) { |
101 if (margin_space > 0) { | 101 if (margin_space > 0) { |
102 margin_left = margin_space / 2; | 102 margin_left = margin_space / 2; |
103 margin_right = margin_space / 2; | 103 margin_right = margin_space / 2; |
104 } else { | 104 } else { |
105 // Margins are negative. | 105 // Margins are negative. |
106 if (space.Direction() == TextDirection::Ltr) { | 106 if (space.Direction() == TextDirection::kLtr) { |
107 margin_left = LayoutUnit(); | 107 margin_left = LayoutUnit(); |
108 margin_right = margin_space; | 108 margin_right = margin_space; |
109 } else { | 109 } else { |
110 margin_right = LayoutUnit(); | 110 margin_right = LayoutUnit(); |
111 margin_left = margin_space; | 111 margin_left = margin_space; |
112 } | 112 } |
113 } | 113 } |
114 } else if (!margin_left) { | 114 } else if (!margin_left) { |
115 margin_left = margin_space; | 115 margin_left = margin_space; |
116 } else if (!margin_right) { | 116 } else if (!margin_right) { |
117 margin_right = margin_space; | 117 margin_right = margin_space; |
118 } else { | 118 } else { |
119 // Are values overconstrained? | 119 // Are values overconstrained? |
120 if (*margin_left + *margin_right != margin_space) { | 120 if (*margin_left + *margin_right != margin_space) { |
121 // Relax the end. | 121 // Relax the end. |
122 if (space.Direction() == TextDirection::Ltr) | 122 if (space.Direction() == TextDirection::kLtr) |
123 right = *right - *margin_left + *margin_right - margin_space; | 123 right = *right - *margin_left + *margin_right - margin_space; |
124 else | 124 else |
125 left = *left - *margin_left + *margin_right - margin_space; | 125 left = *left - *margin_left + *margin_right - margin_space; |
126 } | 126 } |
127 } | 127 } |
128 } | 128 } |
129 | 129 |
130 // Set unknown margins. | 130 // Set unknown margins. |
131 if (!margin_left) | 131 if (!margin_left) |
132 margin_left = LayoutUnit(); | 132 margin_left = LayoutUnit(); |
133 if (!margin_right) | 133 if (!margin_right) |
134 margin_right = LayoutUnit(); | 134 margin_right = LayoutUnit(); |
135 | 135 |
136 // Rules 1 through 3, 2 out of 3 are unknown. | 136 // Rules 1 through 3, 2 out of 3 are unknown. |
137 if (!left && !width) { | 137 if (!left && !width) { |
138 // Rule 1: left/width are unknown. | 138 // Rule 1: left/width are unknown. |
139 DCHECK(right.has_value()); | 139 DCHECK(right.has_value()); |
140 DCHECK(child_minmax.has_value()); | 140 DCHECK(child_minmax.has_value()); |
141 width = child_minmax->ShrinkToFit(container_size.width); | 141 width = child_minmax->ShrinkToFit(container_size.width); |
142 } else if (!left && !right) { | 142 } else if (!left && !right) { |
143 // Rule 2. | 143 // Rule 2. |
144 DCHECK(width.has_value()); | 144 DCHECK(width.has_value()); |
145 if (space.Direction() == TextDirection::Ltr) | 145 if (space.Direction() == TextDirection::kLtr) |
146 left = static_position.LeftPosition(container_size.width, *width, | 146 left = static_position.LeftPosition(container_size.width, *width, |
147 *margin_left, *margin_right); | 147 *margin_left, *margin_right); |
148 else | 148 else |
149 right = static_position.RightPosition(container_size.width, *width, | 149 right = static_position.RightPosition(container_size.width, *width, |
150 *margin_left, *margin_right); | 150 *margin_left, *margin_right); |
151 } else if (!width && !right) { | 151 } else if (!width && !right) { |
152 // Rule 3. | 152 // Rule 3. |
153 DCHECK(child_minmax.has_value()); | 153 DCHECK(child_minmax.has_value()); |
154 width = child_minmax->ShrinkToFit(container_size.width); | 154 width = child_minmax->ShrinkToFit(container_size.width); |
155 } | 155 } |
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369 if (style.isHorizontalWritingMode()) | 369 if (style.isHorizontalWritingMode()) |
370 ComputeAbsoluteVertical(space, style, static_position, child_minmax, | 370 ComputeAbsoluteVertical(space, style, static_position, child_minmax, |
371 position); | 371 position); |
372 else { | 372 else { |
373 ComputeAbsoluteHorizontal(space, style, static_position, child_minmax, | 373 ComputeAbsoluteHorizontal(space, style, static_position, child_minmax, |
374 position); | 374 position); |
375 } | 375 } |
376 } | 376 } |
377 | 377 |
378 } // namespace blink | 378 } // namespace blink |
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